Who is going to staff those restaurants (and other low-wage services) when the housing prices are so high that it isn't realistically possible to find a rent (forget a mortgage) low enough to be affordable for someone making those low wages?
This is made worse in places like south-bay/SF area where the private busing and 2nd/"weekend" apartments further distort local taxing/etc and drive prices up even further.
> I don't know how many people have been forced out due to the gentrification.
That depends on a lot, but when money is involved, there are lots of creative ways people can be forced out. Zoning laws and other "fees" are common. If renting is involved, buying out the landlord and raising the rates on the tenants (sometimes to unreasonable levels designed to not be paid) is a popular move.
> Generally, this seems to me like a great example of gentrification.
From your description, that sounds like an example of how a town or city should be maintained. There is a difference between rising housing prices from normal inflation and gentrification.