Thing is if they were really concerned with the old Bitcoin, they would be more concerned with the main chain. Which I'm not so sure that Jimmy is. Still, the more that can discuss without trolling, outright lying and smears the better.
Side note. Banks (any third parties, even sidechains or second layer applications) taking over is a risk that would be lessened by everyone running a single full, mining, node themselves. But the thing is this can't be done reliably so far. There's no way to check for identity without introducing gatekeepers and compromising privacy. Hence Satoshis choice to let miners specialize and have their long term incentives align by becoming invested in the system is still the best. (If a takeover happens, or if the developers simply don't make the right choices, a fork is of coruse always possible)