I myself will definitely keep playing PBEM besides TCP/IP. As was pointed out, it is sometimes hard to get all 10 players of the game in front of a PC at one time.
But nevertheless TCP/IP is quite a fun when you have some time as it makes for a much faster game (multiple turns per hour not one per day). With 2 players and a small universe we accomplished round about 10 turns per hour. Further, TCP/IP is made quite comfortable as the game can be minimized at all times and will “beep” if a new turn arrives. You don’t have to sit in front of your PC and watch the same SE4 window all the time unless something is really happening.