"invest in new equipment including DSLAMs and MSANs".
"BT ... continue to pay to maintain them and invest in new equipment including DSLAMs and MSANs. Do you really think any other organisations would be willing o carry on with this?"
Utter tripe.
First, pop over to www.samknows.com and see who's LLU'd your exchange, or any random exchange of your choice. If it does have LLU (which not everyone will, and we'll come back to that, but 70% of exchanges currently do), there'll probably be around four companies besides BT who are "investing in DSLAMs and MSANs", installed in the BT exchanges and connected with BT wires but using LLU kit and bandwidth for everything else besides BT Openreach's "local loop". And the services the LLU ISPs are able to provide are, and will be, years ahead of what BTwholesale are, and will be, able to offer to BT-based ISPs.
Second, there's the long-awaited and much over-hyped 21CN. It turns out that 21CN isn't actually about investing in improved services, it's about reducing operational costs (primarily staff, there's a surprise).
The big thing that BT did get nearly right was near-universal coverage (let's ignore the notspots and Exchange Activate, shall we?). But even that's about to vanish.
The total lack of effective regulation and in particular Ofcon's recent crazy decision to explicitly deregulate many geographic areas of the UK broadband market [1], together with the incompetent way BTw have been allowed to introduce its next-generation broadband (Wholesale Broadband Connect, WBC) with an interconnect pricing scheme unattractive to all but the largest ISPs (eg BT Retail) [2], are going to reverse the concept of broadband available at a single nationally uniform price from the ISP of your choice. In areas where there is no LLU presence (ie the 30% of exchanges which aren't financially interesting for LLU), it will soon be back to a BT monopoly from end to end, and the price won't be pretty at all (eg a £10/month "non-LLU surcharge" is already common from ISPs who currently offer both, and with BT WBC it'll get worse not better), because the price will solely reflect the costs of the most expensive areas.
First against the wall when the revolution comes? I certainly hope so.
[1] http://www.theregister.co.uk/2008/05/21/ofcom_ends_broadband_regulation/
[2] WBC is offered on a geographic basis. A BTw-based ISP who wants to continue to offer national coverage the same way as they do today has to pay (lots) for multiple interconnects between the ISP's own network and each of BTwholesale's geographic WBC areas. In contrast, today's setup charges a BT-based ISP pretty much the same regardless of where the end user or the ISP is, and the LLU ISPs just pick areas that are cheap and convenient (ie profitable).