Yeah, I suspect it's inevitable, but if it's not to be followed by a long period of violence it will take a long time. And Brexit has almost certainly accelerated the process. Scottish independence would be another potential accelerant.
I'm more intrigued/concerned by the simultaneous local council elections - which, to me, seem to illustrate the continuing Americanisation of UK politics.
That is, it's becoming more like the US, in that "the left" is increasingly comprised of the young, educated and urban, while the traditional working class areas (now increasingly elderly and disproportionately pensioners) are becoming an increasingly important part of the Conservative base. It's not the whole way there yet, but the political alignments looks less like the traditional class-based one and more-and-more resembles what I see in the US.