Cinebar - I love your opinions! I have always appreciated reading your contributions and your sound judgement. I agree with everything you said. There are many issues from a technical standpoint. If we have online live play, it is going to require that everybody is running the same version of the game. This means no mods or cheats also. There are going to be issues with lags and internet speed. If you have slow or satellite internet, playing an online game is going to be very miserable. Right now, you only have to fight slow internet when downloading updates, which doesn't require you to be actively involved. Whereas with live gameplay, that effects every aspect of your gameplay. Where are the game saves kept? Probably on the cloud. This means EA will also be responsible for backups and protecting servers from hacks. Money $$$$$
Another critical issue that is foreseeable to me is the large amount of maintenance that will be involved. EA/Maxis will have to run servers 24/7 to support the game which is going to be very costly. There are going to be people who use online interactions for inappropriate reasons and mods will have to be heavily policing the servers which is going to be costly. If it involves a minor, then this company is going to be the centerpiece of a big scandal. People who cheat or mod their game may become banned to ensure that everyone is running the same version. Also, when it comes to making sure everything is online compatible, there are going to be a lot of sacrifices in game quality. I don't believe there will be a big loss in graphics, but I believe game functionality will suffer greatly. We have seen this happen already. Interactions will be stripped down so that we can interact with other players. Houses will be made basic to facilitate concurrent play. I also noticed a video going around about 50 hidden gems from the sims 2; you can kiss those goodbye also. When the sims 5 comes to the end of life, the whole game will become wiped out because EA will no longer be supporting the game.
Another reason which is sufficient alone is that this idea is so unpopular among our community and we don't want it. The sims has been successful because it had a winning formula. There is no reason to change it!