Which, ironically, are all DOO or DCO or whatever you call it, revenue-only conductors notwithstanding.
I don't think expansion of Metrolink onto Manchester diesel suburbans[1], or the Blackpool tramway through to a bay at Kirkham and Wesham, would be a bad idea at all, to be honest (I think the Blackpool South one is a particularly good idea, in fact) - but it does leave lines like Ormskirk-Preston, Kirkby-Wigan, the Cumbrian Coast etc rather at risk in my view. And closure of those would be very much a bad thing with the occasional ruminating about Merseyrail extensions.
[1] I also wonder if the idea of Metrolink taking over electrified heavy rail lines and operating "tram train" without any street running, along the lines of London Overground, might not be an utterly terrible idea. The Hadfields would fit this quite well for example. That too would be, err, DOO.