Welsh here. Not everyone speaks it, but that's because the English (even as late at the 1950's) used the school system to literally beat it out of us (look up the Welsh Not). Even with that concerted effort to force the language out, it's growing again after a few generations have passed. Being from the south, I know relatively few people who speak it fluently, but I know exactly 0 people who would actually want it abolished.
FYI, here in North of France we've got a regional meal called Welsh, which is composed of a grilled slice of bread, ham or bacon, drown in a preparation of melted cheddar, Guinness beer, Worcestershire sauce and mustard. It goes with chips and a pint of pills. It's part of our hangover medication. You can top it with a pan fried egg.
Man, what a knobhead. While I suspect that plenty of welsh voters voted to maintain the language, I bet that most of the votes are from non-brits who voted to maintain it just to piss this jackass off.
One on hand the language is practically dead and won't replace English as the language of business and diplomacy in Wales, but on the other hand preserving a dying language is cool. So idk I'm torn.