OpenSim may meet the needs of many institutions, or some other grid somewhere in the metaverse. I neither know nor care greatly, personally.
Linden Lab has a perfect right to run their business as they sit fit, even if it seems to make no sense.
The rest of us general users are just simply helplessly watching as some of the best innovators, providers of content, and ... our friends drift off to other grids. I feel no one is really concerned about what this means for the rest of us who simply value the contribution of educators, non-profit staff and non-profit volunteers in the SL community. We attend their events, use gadgets they produce and invite them to our stuff too. We learn and grow and make a difference in the real world through networking with peace groups, social justice groups, environmentalists. That's all diminishing or ending.
We are the ones who will be left behind in a place that has had a good piece of its heart torn out. Will it be a place we will want to stay? I sincerely doubt it, speaking for myself.