Would be nice to have something like this, but as already mentioned all resources are going to the MMO.
The progression @calm walrus mentions is of utmost importance. We have an approved gfp about it that will likely not see the light of day but targets all the right points we need. https://discord.com/channels/760344898200666112/1436815138639446126
Regarding the current topic, as Spoon mentioned we talked about it a few times.
In my opinion the best course of action would be to merge Survival and Ascendant into a single PvP/PvE mode similar to Legion TD 2. It's a 4v4 mode, people can build either solo, or duo (there are strategies around both). It mixes quite well player vs environment by fighting 30+ waves and player vs player being 4v4.
It merges the best of both modes, and alot of the work around it is done already. We have to build the map layout and gameplay format. It can work quite nicely for us and to me at least sounds very fun.
I'm not sure when or if it would be possible to start working on these things but if we have Ascendant (not the current one), Gauntlet, the 4v4 mode, a decent MMO feeding us gameplay and illuvials, and the Collection Tree binding everything together, we would be in a pretty good position.