No big deal on splitting the community in half? Matt will not go and you will have half the people supporting him, half forking the project. Actually less than half on each side, when you count in the people that will completely leave the ecosystem...
They aren't acquiring new customers faster than they are losing existing customers. Squarespace and similar products are to eating it's proverbial lunch among a large portion of their audience (small to medium businesses who just want a website that is easy to update).
If some of the biggest hosters forked wordpress and started adding features that their customers are asking for, that wordpress the organization were ignoring or slow to produce, I think it would be a good thing. Providing wordpress the org with some motivation to compete.