In this case, to have more reliability in transmission, you have to have fewer choices.
I can't speak to the UK's digital situation, but in the U.S. there are 50 channels available in a theoretical city. Assuming that digital has fewer co-channel issues than analog (most of my TV experience is analog), that means 25 signals. On those 25 signals, some broadcasters squeeze up to 10 channels, which all look like garbage. For a decent picture, it's closer to four — maybe five.
So that means 100 to 125 theoretical OTA channels.
If people could actually receive 125 OTA channels with good programming on them, or even the same content as is offered on cable/satellite, I believe many would drop pay TV in a heartbeat, and wouldn't be forced to also scrounge for content on Netflix and YouTube and Prime Video.
If anyone has information on the theoretical maximum number of TV channels possible in a single location in the UK, I'd like to hear about it.
Just like the phones in the UK will, in the not too distant future, move from POTS to a fully packet switched network, so too will television, especially once at least superfast (24Mbps and up) broadband is available to all - there are already rumblings that Sky would like to move to IPTV instead of having to bounce their signals off a satellite.