I share(d) that concern. Mitigating this is that a lot of (low to mid range) alternatives seems to have gotten steam: Lattice Semi, Efinix, Gowin, and more that I forget at the moment. I'm rooting strongly for the underdogs to become viable alternatives to the current duopoly.

It would of course have been preferable for any of them to directly support the open stack (yosys, nextpnr, and the various bitstream generators); Lattice's ECP5 is nice, but not very fast.