They also had the Olympic Stadium in Munich reserved this summer and nothing came to fruition either.
Furthermore they'd at least need a single that gets halfway regular airplay (the current tracks usually do for a few weeks). But without a new release THINFS will be 1.5 years back by the time they'd come to Europe next summer.

I could be wrong but I doubt that Bruce will tour next year either. If he does I would figure a solo show not a band show which would not fill big stadiums.

not unheard of for a veteran band to tour sporadically and spend 2 to 3 years on a record. Bon Jovi has always had something out but that doesn't mean it's not doable, especially if the new songs aren't gaining new hits or appeal.....

Small indoor venues

Apart from the odd Festival, when was the last time the UK Tour was a sell-out? I don't think it ever has been from 2005 onwards.....

I could be wrong, but I think the Wembley Stadium show last year was sold out

It was, but that was Bruce with the E Street Band. Bruce as a solo act is probably not going to fill a stadium - he never has in the past.

On his twitter Phil says next year Europe tour "I think yes"

Also said that for this year, the SA dates would be It....

Phil X just confirmed that they'll be in Europe next year on Twitter.

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Rock in Rio 2018 will be in Lisbon again (23-24 and 29-30 June). So there's a good chance they'll do at least a few shows around Europe

If it's a short European leg then i think they'll play in Spain (Madrid?), Italy (Milan?) London, Dublin, Munich and RiR (Lisbon) as mentioned before

If their European Tour is bigger than the SA Tour they'll propably play more shows in the UK (Manchester?) and Germany, 1-3 shows in Scandinavia, hopefully Vienna and maybe Prague