@QueenCold
Honestly I think this would be a good and less predictable ending then having Twilight once again save the day or more take credit for it; because seriously, outside the season 1 opener and season 2 opener, and season 4..ish the world saving had a lot more to do with everyone else and yet Twi seems to be singled out as the special snow flake.
Having the girls plus spike would show that they like Twi last season have been tested and proven themselves and are now worthy to be elevated to the next stages of their lives as possible guardians of their elements. There is no need for alicorning them since being guardians does not mean princesses. PLus the RP with slight mode for next season will do fine in indicating a change plus new toys always makes Hasbro happy. In addition we might finally be able to enjoy new storyline with the girls being challenged in their new roles, being teachers of their elements to the populous and so on.
For Spike, this would elevate him as something more then “Twilight’s little helper” or “The girls baby dragon friend” and give him possible storyline away from the girls to grow into a fully 3 dimensional character.
One thing I had hoped for S5 is the possibility of having a DQ2 where we meet more dragons and see that there not all ass-hats and Spike is able to come to terms that ponykind is not the end all be all culture that the show runners in S2 made it out to be.
Also another theme is I would love for Spike to redefine a dragons horde to that of ponyville as the thing that is worth the most to him. I think that would make an AMAZING episode, showing how one should protect the things that love and hold dear.
One more element that I think would be interesting would be adding a new dragon character. Taking Whimsey Weatherbe and G4ing her would make for a great addition to the cast and meet toy mandates for Hasbro.
Her character could serve as someone he can learn dragon culture from while taking his “Dragon Code” and refining it through teaching a wild but loveable Whimsey that there is more then one way to be a dragon.