Um, you do realise that there are offline versions of the tools available with a simple PM? There are even cloned versions of the online compendium available on a few websites.I often think about running a bit of 4E again, but with the DDI dead, my enthusiasm just dies again. 4E was a great game, but the DDI is what kept quite a large, complex game properly organised and accessible to the players, and as it got shut down permanently not so long ago, I just can't really face leafing through books trying to find stuff, not when the DDI was there in one form or another for most of the time we seriously played 4E. I have copies of most (not all, sadly, I couldn't log in during the free period near the end, it just wouldn't take my login) of the characters we played and actually I think all of the monsters I created/modified (as PDFs) but... I want that lovely online rules encyclopedia and so on.
I guess 5E will eventually see the same fate with Beyond and stuff, but I suspect it'll last a long time after any 6E.