That wasn't unexpected tbh. It was unlikely that Ford would be able to replace that capacity from elswhere. Long term, I don't think it is significant, or likely to be the start of a trend. Jaguar appear to be going to manufacture their own engines in Wolverhampton, so that capacity will replace at least part of what is being lost in Bridgend.
UK car manufacturing is in a fairly strong position - whilst a lot of components are imported from within the EU, the bulk of the finished cars are exported outside Europe (and this applies to the MINI in particular). Provided the currency remains stable and the UK workforce doesn't price itself out of a job (as happened in the 1970s), I remain optimistic about the future.