Dear Karoly,
Nice essay! A few thoughts come to mind.
1. Regarding the "Higgs Aether" view you mention, I think this is something worth thinking about, in the following sense: suppose the Higgs boson had been discovered in 1900 rather than 2010-2012. Would not the scientific community then have concluded "this is the aether?" It's funny how much the view of "spacetime" as "empty void" has changed since Einstein argued in his SR paper that light requires no supporting medium.
2. I agree with the statement that "all this tells us that understanding the fabric of the vacuum is the most important thing if one want to understand physics." (page 3)
3. Regarding the cosmological "constant," the causal set theorists have some interesting ideas on this. I am working on a similar approach myself.
Thanks for the enjoyable read! Take care,
Ben Dribus
P.S. There has been a lot of "ratings chaos" the last few days, and one hesitates to comment on people's threads for fear that the author will suspect one of giving a low rating. I want to assure you that I admire your contribution and gave it the rating it deserves.