It does have quite a few exclusives, also, the system was successful in Japan, there are about as many Vita's as there are PS4's in Japan for example.
The problem with the vita was the memory cards and the lack of proper marketing, which resulted in failure in the west. There are tons of games still being released for the Vita this year, I plan on ordering Super Robot Wars X for example, which will be getting a physical Asia English release in April, just like what happened with SRW V.
Caught wind of this the day the Github page launched, very interesting indeed! Built it myself for Windows and tried a couple of homebrews; only SpiderVita, VitaTester and VitaHockey out of about 10 homebrews I tried work, but I'm very optimistic this emulator will grow even bigger.