Excuse me, did they really mention the U.K., or is that just your comment after reading this forum? What exactly did they say?

If all they said is that they "will no longer be offering", that's bank speak for offering applications, not bank speak for discontinuing existing customers. Same for the term "issuing". But I'm not clear whether you are repeating word for word exactly what they said.

Furthermore, they're only been issuing corporate cards for a while.

But there are more cards that corporate and personal. Most of the non-corporate cards that got inherited from Citi for "professional" cards, which is a category between "personal" and "corporate".

And, btw, they've never issued professional cards since acquiring Diners Club North America from Citi (or even a while before that, Citi didn't issue them any more either). They only issued personal cards, apparently as an experiment, and didn't like the results of that experiment.

So it's not really news that BMO only plans to issue corporate Diners Club cards going forward. Most of us have suspected (if not known) that for years now.

But that doesn't necessarily mean that they plan to dump personal and/or professional card holders onto the sidewalk. If all they were talking about was the issuing of new cards, that's all they were talking about, and you shouldn't necessarily read anything more into it.