The thing is that Maiden (and every other band from the aforementioned) are not getting any younger, so new music as soon as possible. We don't want Maiden to become a cabaret act, right......
I can definitely see where the "not too many years left/not getting any younger/wasting time" point is coming from, but then again, it's also arguably one of the strongest justifications to move releasing studio recordings to later period and tour with a show that includes stuff like Aces High, Where Eagles Dare, Flight of Icarus, Hallowed be Thy Name and Run to the Hills
all in one set when they still, giving absolutely their best effort and keeping stunningly high level nigh after night, definitely can. Touring with set heavily centered around recent songs is one of the biggest statements by the band even in this decade, but The Legacy of the Beast is almost if not just as big statement of the quality and power of their live shows. So, all things considered, the age point kinda works in both ways.
As for the release date of the album, I'd put my money on september/october next year,or possibly somewhere around december, if there is any kind of live release on the way (probably not). It would be kinda cool if they actually released official full concert live footage
before the 2020 leg, but I don't really see that happening, so new single right after the tour and album release a couple of months later sounds more or less plausible. Of course, playing a taster in the set next year isn't completely out of question.
I guess my main point was that as much as I'd like to get the new album, the LOTB leg next year isn't really that big of an issue when it comes to releasing new material. I mean, looking at the touring/recording cycle over the years and this decade, I doubt they'd get right into the #18 anyway. So, in the end, I don't think that doing LOTB next year excludes any future releases that would happen if they skipped LOTB completely. In fact, if they have another album-hits-cycle left in them, it might very well be that skipping the omitted markets next year would mean that instead of LOTB, it'd be the next (hits) tour that gets stretched, delaying the Theoretical Album #18 instead of #17...
Anyway, we'll see. Looking at the bright side, even though I hoped for new album before next summer, it still looks like the release might very well be within next twelve months or so. Could be worse, I guess.