Exaltys said:
I think online for Mario Party would ruin Mario Party. Like sorrycostello said, lag would make it horrible. Also, Mario Party, Mario Kart, and Super Smash Bros. are at their funnest when you are playing with friends in person.
There exists algorithms to hide lag (even if it is there, the system buffers it out with really clever mechanisms).
What I would like to see for a Mario Party is:
Tons of modifications to purchase in shop (I feel compelled to complete games 100%)
Tons of mini-games to purchase in shops (must play first to unlock)
Tons of mini-games (That are fun)
Minimal amounts of items in the game (some of them were junk)
Minimal amounts of waiting time between turns (I hate seeing player X's turn pop up)
Epic difficulty levels to unlock better features
A level system (similar to mario kart with remakes of the older boards)
An actual fair system to earn coins without abusing some functions
Customizable levels (similar to brawl)
Option to allow everyone move at the same time (reduces time)
Criteria for winning options (best player after X turns, most coins, most starts, first person to X...)
Unlocking character system similar to Mario Kart some of which even require previous saves from random games
Mini-games that feature previous nintendo games (SNES mario kart anyone?)
An online system with rankings (similar to mario kart)
An online system that features excellent algorithms to reduce lag
An online system that allows unlockables for offline and vice versa
Ability to allow more than 4 player rounds (must be combined with allow everyone to roll at the same time)
...
I could go on forever, those kinds of things.