The title is illustrative, but it can be added that there are no comparable alternatives for it, at least at the time. Moreover, it is predicted that finally some alternative will be presented, however, there is no info about its quality or details.

  • 1
    As in: no alternative can be better than it (all are far worse or at least nowhere near as good as this one)? That sort of thing?
    – Lucky
    May 15 '15 at 12:06
  • Yes, this is the case at this time but we are not sure about the future.
    – Eilia
    May 15 '15 at 12:09

I don't think I can come up with something that would encompass both - that this is by far the best alternative and that whether it will remain so in the future is uncertain. As it seem logical that the first part is essential I suggest:

unsurpassable (ODO):

Not able to be exceeded in quality or degree:

For those who don't know, he was the unsurpassable genius responsible for the first Incredible Hulk and Fantastic Four strips - in other words, one of the greatest visual artists of the twentieth century.

For the uncertain future you can use something like:

hitherto (ODO):

Until now or until the point in time under discussion:

As someone who has hitherto needed to reject one thing before moving on to another, Juliet is on her mettle, and she knows it.

Although, you should be careful with this and similar expressions (so far, until now etc.) because it might depend on the context whether it will mean that until now it was so, but you don't know how things will be in the future, or that until now it was so, but for some reason it isn't any more.

  • unsurpassable seems to be more appropriate since it is a bit moderate than sine qua non
    – Eilia
    May 15 '15 at 12:36
  • Good advice, agreed. Again thanks for your answer and responsibility.
    – Eilia
    May 15 '15 at 12:51

The Latin (now English) phrase sine qua non means

An essential condition; a thing that is absolutely necessary: grammar and usage are the sine qua non of language teaching and learning

It literally means without which not.

A phrase that connotes high quality is state of the art

The most recent stage in the development of a product, incorporating the newest ideas and the most up-to-date features.

However, this term does not require that the product or service is unique. A number of examples might be state of the art.

The term nonpareil does convey unequalled

Having no match or equal; unrivaled: he is a nonpareil storyteller [POSTPOSITIVE]: a film critic nonpareil

all definitions from Oxford Dictionaries Online

  • I like sine qua non, it seems to be appropriate.
    – Eilia
    May 15 '15 at 12:26

I'll give it a shot:

  • The guitar skills of Jimi Hendrix are incomparable

  • The statistics of Sir Don Bradman are unparalleled

  • The success of the iPhone is unprecedented

  • The career achievments of Meryl Streep are unrivalled

  • The beauty of Miranda Kerr is matchless

And the most fancy of all...

  • Da Vinci was a nonpareil artist. (can also be a noun) (Oxford)

My suggestion is quintessential:

Representing the most perfect or typical example of a quality or class:
he was the quintessential tough guy—strong, silent, and self-contained
Oxford Dictionaries

An idiomatic phrase that is used to refer to someone departing that was held in high esteem is: a hard/tough act to follow.

to be so good it is not likely that anyone or anything else that comes after will be as good
Last year's thrilling Super Bowl, when the New York Giants beat the Buffalo Bills 20-19 will be a hard act to follow.
The new Chairman knows his predecessor is a tough act to follow.
The Free Dictionary by Farlex

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