According to NTT reports and others, P2P occupy 50% of internet traffic. As people know, normally P2P is used to download movies, songs, books which are violating the copyright. So in few country, P2P is blocked by the ISP. How about Indonesia ? I believe many companies/ISPs also have tried to block P2P but not because of copyright, but because bandwidth consideration.
Blocking P2P for corporate users might be ok as users should use internet for their job (not for downloading movies), but for home users may be not acceptable in many cases. Home users will try to find other ISP that don't block P2P. If the policy come from government forcing all ISP block P2P, it will be good. At least 50% of internet traffic can be used for the usefull things.