There are many option other than BIP 101 such as BIP 100, 102 & 103.
I think BIP 100 & BIP 103 looks better than BIP 101,so why many companies want use BIP 101? Are they have hidden motives or there are flaws in BIP 100 & BIP 103?
BIP100 in addition to dynamically changing blocks. There's no need to give miners any power and thus the main arguments of the XT propaganda group fall down the drain. Well god knows what Hearn promised Coinbase. It is problematic because of many thing, one being this:
Mike Hearn will be the benevolent dictator of XT. In other words, he will implement whatever bad companies need/want regardless of what the users think. So much freedom of choice.

Forum is under constant DDOS attack, Theymos should do something about it like installing a cloudfare.
No, it is not; and cloudfare is bad. This is off-topic though.