I had a few or rather couple problems with their implementation of the said change. They could just move all ships outside the 10AU wall back to a station in system or nearest station in the case of 0.0. They have done the same for Titians when they were stuck coming out of the cap array initially so it is possible. Or leave them in space just remove the bookmark, and 3 below should cover the rest.
This would be my suggested fixes :
1.) Prevent bookmarking while on a E-warp, obviously when you come back online.
2.) remove all 10+ AU, or even 50+ AU, from system core Bookmarks.
3.) prevent BM creation at more than 100 AU from the outskirts of the solar system.
4.) E-Warp current ships out in a deep deep safe back to a 75 AU safe at random, or put the ships in station.
1) prevents the current mechanic from working anymore
2) gets rid of all the really really deep safes but leaves some that are closer to the system intact
3) prevents even more deep safes from being created... well ever.
4) prevents "I lost my stuff" or "I'm gonna lose my stuff" tears, though they are delicious!
DO NOT prevent warping out that far! what happens if I make a BM right on the 10AU boundary and then fly the extra .1AU am I suddenly unable to be scanned or if scanned down unable to be warped to? Don't you think someone (goons) are going to find the very last KM they can make a Bookmark to and then BM that and fly the 1km deeper into their new shiny ultra safe! I guess that is my main problem with the current idea, it could still be scammed. By setting up hard rules, it only allows for future abuse. Keep the rules fluid and profit!
Bottom line deep safes need to be removed from the game. They allow too many easy escapes, too many CS in space safe from destruction and such a easy out for anyone who wants to stay safe regardless of shiptype, it really makes no sense and is an exploit of the game mechanics.
In no way does the solution need to feel like or look like a giant space wall! Speaking of...