Nah. Water is the best type, <3.
And grass fire water has always worked. I'm glad they aren't changing it. It makes it easier to compare the generations. : D
its a tradition sort of thing and that grass fire water all have one weakness and one strength in the group.....they could do a psychic dark fighting group(psy<dark, dark<fight, fight<psy), or electric rock/ground water, but the games also tend to have very few fire, water and grass types(well maybe not water

) so it allows you to have arguably the best from one of the types in the game
oh and they are throwing in A LOT of changes in these new games. cities are gonna be MASSIVE. pokecenter/mart have become the same building. your characters are supposedly older(yay no more 10 year old children, maybe theyll actually have ash age for once in the show). oh and there are gonna be A LOT of new pokemon, they say there will be a few of the favorites(pikachu, magikarp/gyarados, bellsprout/oddish, wurmple/caterpie/weedle, etc. are my guesses as to what stays) but the games will rely more heavily on the new ones.
oh and rumor has it that zekrom may actually be an electric/dragon type....a voice actor for the show who does most of the electric types expressed interest in the voice of zekrom because of its type on their blog, the post was removed shortly afterwards.