do you ever forsee a time when this will happen?
Yes. In a couple of hundred years, every English speaking person will sound like Tinie Tempah.
It’s interesting, isn’t it. The UK has very clearly entrenched accents, so you’d think that they’ll never change (otherwise, it’d already have happened). But I can tell a difference even now between the “Lanky” dialect my grandparents spoke and the accents I hear around town today.
The accent has softened, and the colloquial phrases have all but died out in favour of more common language. If I told a teenager to put wood i’ thoil, I’d get a blank look. Whether this is good or bad I’ll leave as an exercise for the reader. (-: