There is an argument that the Church of England no longer has the "vast funds" it used to have (it suffered heavily in the property/pensions scandals years back); it's currently living in austere times with rising costs, far too many buildings needing maintenance, and dwindling congregations. Locally, for example, they have had a fire-sale of assets and have launched a massive campaign for yet more money from the flock - which AFAIK hasn't been met entirely favourably by the faithful. There is a conception that there is still too much junketing being done by bishops .........
Inevitably congregations will merge and there will be church building closures in the future. Again, locally, the Latter Day Saints (Mormons) have been actively looking to share premises with the CofE and the Diocesan powers-that-be have given a tacit nod to it - some Evangelicals might consider that to be little short of heresy!
I just hope the redundant churches aren't all sold off and turned into mosques ....
I know the Cof E had a hare-brained scheme to buy up redundant RBS bank branches not long ago, but I think Welby's current plan is merely to link up with and promote existing credit unions. Which is not a bad thing.