If you mean about the older Pokemon having new evolutions in the future, I actually see this as possible if Nintendo decides to make a re-enhanced version of the older games.
Seviper having an evolution seems pretty interesting and it be nice to see both and Zangoose to have an evolution in the future. However, I am tempted to say that maybe not all pokemon need to have an evolution though Seviper having one would be interesting.
No, I think Ekans and Seviper are doing just great without any other evolution forms. To be honest I don't even like when they put some new evolutions to the old Pokémon (Kanto/Johto). I also love the one-evolution Pokémon pretty much (like Farfetch'd), so you guess I was a bit disappointed when they bring out a Buffalon even it's cool ^^
Everything is possible.
Signature is a WIP for the moment.
For now, I have claimed: Mewtwo, Member's Card, Wide Lens, Honey Gather, and Psystrike.
Arbok needs an evo, I think.It's stats are terrible.
A split evolution makes no sense when Arbok itself needs an evolution.
No. I was thrilled when I found out that Gen V had no old Pokémon involved. I do like some of the evolutions introduced in future generations, but I would rather have new Pokémon than old modified ones.
If you mean to evolve into seviper as well, then difeitely not.
The moment man devoured the fruit of knowledge, he sealed his fate… Entrusting his future to the cards, man clings to a dim hope. Yet, the arcana is the means by which all is revealed. Beyond the beaten path lies the absolute end. It matters not who you are… Death awaits you - Nyx (Persona 3)
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Arbok and Seviper's stats are kinda crummy, but they did get some love in 5th gen. Their new move, Coil Around, raises Attack, Defense, and Accuracy by one stage, making it the only other move besides Butterfly Dance and Shell Smash to raise three stats at once. The Accuracy boost also means moves like Gunk Shot are much better, especially since they get STAB from it. They could still definitely use evos, but they're not nearly as bad as they were.
There's really nothing more that can be done to Arbok. It's a super-huge snake. Why does it need upgrading?