[MFTJA]

With the future being streaming services taking more viewers away from channels I'd definitely consider getting rid of channel numbers having set names and shows fitting to each.

Respectfully (and see it in my day job) - if it works, don't break it.

But would this numbered channel thing be a thing in next 5 to 10 years when streaming hits bigger heights?

People have been saying streaming is going to take over for years - indeed I stream most content, including Live TV. Yes, it has done extremely well, but TV audiences are still very large. If streaming does get so massive that ITV struggle to attract any viewers, I think they have more to worry about than if their channels have a numeral at the end of their names.