The multi stadium days are definitely over. As far as the UK goes, they would play stadiums in London, Manchester, Bristol, Southampton, Coventry/Birmingham, Glasgow, Newcastle etc.. on the same tour. Even on the WAN tour, they did ok with the numbers despite doing many stadiums.

GnR come over and did a huge 2 nights at the Olympic Stadium and that was it. I know it's not comparible per se, but there's no reason why BJ couldn't do the same. It wouldn't be 5 or 6 stadiums, but 1 or 2 could easily do, be it both in London or 1 in London, 1 in Manchester for example.

Or they could play a few arena shows in the big cities. They'd do well (tickets would be pretty dear sadly) as they have quite often over-saturated the demand previously, so less is more in terms of this tour.

Edit: Having just finished the podcast, it does sound like the "No Stadiums" bit was in reference to NY/USA as opposed to anything else. There didn't seem to anything even remotely alluding to Europe or where these 30 shows would be.