The problem is that you've written a sentence form that appears in many introductions of technical manuscripts with a different meaning: "There has a sparsity/paucity of research in this area[, motivating me to work on it]."
It's a given that more research can be performed; it's not necessary to inform the reader of this. It sounds like you mean something like the following:
The study of A has emerged as a distinct field that now merits a review.
There is now sufficient research on this active topic to review it.
This burgeoning field is now broad enough to usefully review.
An appreciable/considerable/notable amount of work has recently been published in this developing area, prompting this review.
Does this match the intended meaning?