There will be alot of people in the kakky who won't be able to afford the mortgage when their rate goes up and won't be able to remortgage either due to changed circumstances or lending criteria!! 
Sadly I think you may well be right, particularly with younger / newer borrowers who may have over extended when rates were low
I am with Halifax but on a base rate tracker so sitting fingers crossed...
We could survive a rate increase, even a biggish one, but I do worry about younger borrowers, that said everything is going up and no raise in Pay.......something going to go wrong somewhere, and I fear that this may be on a big scale.....

Yes, we're in a slightly awkward position at the moment. Sitting on a very good SVR and can afford a rise of almost as much as it fell by (which I can't see happening anywhere near as quickly, probably take 2-3 years from the first rise, minimum, to get back towards 5% BoE Base Rate) but will probably struggle to re-mortgage due to the change in personal circumstances and house prices.
Fortunately we aren't in negative equity, but we're probably close to 95% LTV which is tricky on a re-mortgage. Thankfully it seems that house prices are creeping back up in this area so should, hopefully, get back to where they were when we re-mortgaged (after the first big dip in house prices)
