What kind of compensation will Kassadin get?

As is common knowledge now, Kassadin's Riftwalk range gets drastically reduced in the upcoming 5.4 patch, from 700 to 450 units. Some League players out there even go so far as to suggest renaming it to Riftstep or Riftcrawl, in light of the drastically reduced range.

However, for me, this is basically Riot finally giving in to the notion that a Blink with two/thirds again the range of Flash on a really short CD might be the source of all his problems, and that it could not be retained at the range it has. So, finally, after almost a year of experimentation, they gave in and finally chopped it down to a more reasonable range - which is a little more than Flash range.

However, this means there will be a decent-sized gap in his power budget. And, instead of bitching about it, how about we think about how to fill this gap? Might be that one of the Rioters of the Balance Team sees an idea in here they might not have thought about...

My personal ideas (not all of them, just ideas):

• Return AP ratio to Riftwalk
• Reduce Riftwalk stack duration somewhat
• Reduce W's cooldown, possibly with levels, so you can include a Sheen item in your build path
• Allow casting of E for half damage if not fully stacked
• Crazy idea: Have the later ranks in Riftwalk reduce the cooldowns on his basic abilities (i.e. Rank 2 reduces Q/W CD by 2 seconds, Rank 3 by 4 seconds)

Do you have any further ideas for unconventional compensations (unconventional = not straight-up buffing existing base damages or ratios)?

And has anybody used on Kassadin before? Both his Q and W active are counted as single-target abilities, after all...