I'm gonna say straight up I don't care for your tone. Please be respectful of the people in this forum.
Your entire argument completely ignores that it's not our job as a wiki to catalogue and make fanart accessible to fans--and especially at our inconvenience--period. It does not matter if that fanart is pretty fanart made by professional artists, either. It doesn't really matter to me whether artists would "understand more" if we put unsourced images on a wiki as opposed to a Tumblr, especially when it's really up to whoever the blog admin will be (it's certainly not going to be me) if the images are posted with a source or reblogged from the original artist.
The tumblr blog is not a necessity, it is not "we either keep the images on here or on Tumblr," it was just an idea someone had.
What we're basically preparing to do is remove the fanart from character pages. Everything else is secondary suggestions on what to do with the pictures so that people who want to still have them will know where they are.
We are not "changing proposals every five seconds," (especially since we've been having this discussion over several weeks,) we are cycling through a set amount of proposals for people who still want to be able to view the fanart that we are removing. So let me state those options clearly for you and everyone else who might be confused on this point:
1. We put some of it up on contributor's pages, under the argument it counts as "concept art" or some such excuse.
2. We take it off all articles but allow it to be found on the wiki through the image category system, which is a seperate proposal. (See Greek's post above for this in a bit more elaboration, basically.)
3. We take the pictures out and let them be gathered up on some other media site, either Tumblr or somewhere else. (This is the proposal you take the most issue with.)
4. We direct people to the artists' media sites so they can look all the pictures up themselves, which is really the default if the other three don't appeal.
I am not sure how a visual is necessary to clarify any of these options but if someone feels like rigging them up feel free. If none of those ideas appeal to you, it will not change that we are taking the pictures off the Misc. tab in character galleries. I think we've argued long enough on this point and I haven't seen one argument for keeping them that hasn't already been countered.
Bold for the most important parts.