@fillertrack Static but still quite large, and the games may need several hours to complete 100%. We are not talking about a dozen of small games.
This would only work if you could release everything you plan to support at the same date, and nothing afterward. A company doing this would need an oversized quality team during the development that the company would have to fire at the end.
If a new game need to alter the emulator to work well, you need to check all the other games against those changes.

Many games released nowadays for the Switch weight several GB. In comparison, 50 MB for a game is almost nothing.