There has to be a chicane somewhere on that straight, although I have to confess I wouldn't mind seeing a slight variation at some point e.g. moving that chicane 200m further along and/or incorporating the roundabout next to Portier. The latter would surely make it tougher on older tyres to get sufficient momentum into the tunnel vs the point+squirt out of Portier.
The main issue with that of course is safety, there'd be roughly 100m of moderately uphill "run-off" before any car hits the barriers at turn 1, not to mention what kind of carnage could happen at that speed if someone gets it wrong, has a brake/tyre failure e.t.c.
As it is, both of those ideas were tossed into the hat long ago along with plenty of other proposals and gimmicks over the years, some more desperate than others... even if today was the first time in my recent memory that something slightly different was tried, the reality is there's barely any wiggle room (in more ways than one) as to what they can do.