Could the devs of 99 make a new game?

[Baler]

Have you heard of Winter's Roar?
It got 'shutdown' by SOE.

I feel like your question is more appropriate for the EQEMU forums.
I Don't think the P99 team has any interest in making a fully custom server. recreating classic seems to be their niche.

I know there are UO shards with custom maps because I've made custom maps for it.
I've always dreamed of mapping out everquest zones in UO but never started it.