The constitution is the most sacred thing in ruling between what is allowed or not... it is subject to ramifications and modifications to improve the basis and nature of our nation, sure... however, modifications for 1-time-only exceptions to extend the term of an X president is like toying and playing games with the constitution, it shows disrespect towards the constitution and therefore the nation.
I'm all in for a modification allowing someone to take on 2 terms in the presidency instead of limiting it to 1 term. But make it as a change in our system, for always. Not an exception.
Everything is possible, but extending for PMA is pretty much a political suicide at this point for major powers in the parliament (Berri, Hariri, Geagea, Joumblatt)... so I don't see it happening willingly, unless HA is willing to do a may7 to forcefully change the minds of FM/LF/PSP and keep his man in baabda...