Yes I was thinking of that being a possibility since Himi did mention about Isaac being in danger plus there is the appearance of the Mourning Moon. Although considering the fact that now everybody is at a higher level, the starting point of the game could have higher leveled monsters but that might escalate quickly with us needing a god-like boss to end it off.
As I said I was thinking the same due to foreshadowing given in the 3rd game, something happens causing Isaac and Garet to lose control of their abilities or something. And I would totally like return of the original party, Matthew's party won't be absolutely unnecessary and they could mix it up. We still have Piers and Nowell to deal with who could be the 2 water adepts this time, one old and one new :D
Oh my, Master Hama? Well considering Ivan has also become considerably powerful that could be a possibility. Although she would be even more mage-type than Ivan? Ivan has become more warrior like as he grew up? That would be cool with Ivan now being able to use broad swords and being the first Jupiter sword warrior. Although Matt's not bad, the older warriors have gained longer life as well as new abilities as they grew up and could be unique to control.
Even if all of them are not playable (I still want playable Isaac as protagonist), I want to see all of 'em! The series could be so much more and Camelot is squandering the opportunity.!
They should follow these steps:
1) Bring Isaac as a challenger for Smash 4
2) Make Matthew an AT
3) Finish re-releasing GS: TLA for VC
4) Launch a 3 game collection for 3DS with updated graphics (no tampering with gameplay)
5) Make a new Golden Sun with Isaac in the lead, with old party! Mix new party in if they want.
6) Make it epic and add requested features above (not affecting the game negatively though)
7) Conclusion: Epic Golden Sun game being the best and most popular = Happiness for GS fans and Kaching for Nintendo
And for people who are not a fan of the beard, how does this Isaac look?