My last part to this (@Havok40k, @Thorbjorn42gbf thanks for your intervention - it was to hot in here):
I have the feeling that some tried voluntary ignore the meaning of arguments (or examples) and instead liked to start a discussion about trivia, single words and semantics. This is NOT "how a discussion should be" because one should always try to understand the viewpoint of the other no matter if you agree or disagree. You can try to convince the other but you can't force him to accept.
(This was my last part about the horrible player interaction and outbursts in here)
We clearly have two strong opinions in this topic. One for temporary beacons and one against temporary beacons. IMO both are consistent and correct (no need to claim superiority ones opinion over others ) but both are argued from different points of view and are based on diffrent motivations.
I've outlined my point of view in a sufficient way and i don't want to start the discussion again.
I don't think we should add to much complexity into singel functions, like special functions guild beacons with special permissions or in a "rent" system. especially the second would harm the gameplay fun for me in a tremendous way and would keep me away from joining a guild or start a community project.
I also don't think that it's usefull to add items in a mid-/late-game in the hope someone who reached that state will return more likely like @Tuudi mentioned . For example i've played GW1 ~1.2k hours and GW2 ~1.4k hours and i left both forever and never came back (and i won't also).
I like the idea of @Stretchious (decay in stages and a "backup"-chest) and @Havok40k (collect everything in a "void vault" till they return). Both would allow players to come back after a long time without loosing anything (or the most). Maybe this idea could profit from a little "polish" and is then acceptable for everyone.
Side Note: This would also be one of the few ideas where i'd accept a "cash-shop". A lot of Data-Hosts demand a fee if you need a "backup-lookup" in their backups (the backups of the hosts). One could argue that inactive players (and their buildings and items) are something like "data" that is hosted by the devs. if these players return after a looooong time they can get back their items for a small fee (the devs have costs with hosting their data) and start again (okay ... the buildings are gone but they can be rebuilt).