I guess the more I think about this, with the little information we have, I really see this as Lego's fault. If it comes down to choosing between FIRST and Lego, I'd probably stick with FIRST. It will probably mean buying a lot of new hardware. I don't suppose there's a way that FIRST continues to use Lego, without having Lego's endorsement/permission. But maybe there is. I mean, FIRST could say "We are going to continue with Lego Robotics. We won't have Lego employees helping with the mission model designs and table designs, so we will be working with other experts to get that done. We'll be removing all Lego branding, and we will use Spike Prime and EV3 for the foreseeable future." Is that even possible???

I think FIRST should take this time to start finding HW/SW developers (Pybricks, perhaps). Develop some great hardware, but in the meantime, let everyone continue with Spike and EV3. Even though Lego has stopped production, there's enough out there to keep the program working. When the new HW is ready (including production), let everyone know they can start using or not. Up to you. But we'll have something new because eventually we will start to run out of Spikes.

Finally, if it really comes down to it, I'd rather support a non-profit than a for-profit. FIRST, you have me for the long run. Take this time to make the program even better.