If there were sufficient demand for higher bandwidth, VM would have found a way of making it happen because it's another service they could sell on a tiered speed basis. Evidently the cost of doing that is greater than the revenues expected from the number of customers willing to pay the necessary extra costs, and I can't say I'm surprised. We'd all like faster upload, few of us need it, and fewer still would pay the costs of providing it.
Likely you'll see change on both IPv6 and symmetrical upload with XGS-PON, but unless you're in the handful of test deployments then you're probably looking at 2026-7 before commercial deployment starts, and even that's (a) optimistic because the announcement about PON didn't appear to include funding for the drop links to individual properties, and (b) even when that happens it would be phased slowly across VM's 5m customers over a number of years.
For most people, better upload/download ratios and IPv6 will be available through Openreach or Altnet FTTP long before VM offer it, and that's not because VM are lazy or reluctant, it's just an unfortunate outcome of the origins and architecture of DOCSIS and the unfavourable economics of changing an analogue RF infrastructure that has achieved remarkable things, but is now unavoidably on the edge of obsolescence.
