I don't understand why you want merge mining. If we can improve the difficulty adjust algorithm, security will be better. All the other independent coins don't have merge mining.
I'm not sure what merge mining has to do with independence. All coins are independent weather they are merge mined or not, you don't have to merge mine it, it's just another option that will bring in more miners & thus help secure the network & attract a wider user base, which is important if a coin is to become successful.
One question:
If merge-mining is enabled, everyone will do merge-mining or not? Otherwise he will lose money?
If so, once TRC merge-mined with BTC, huge mining power will be thrown on TRC. In this case, personal mining will be obsolete. P2Pool could also be obsolete if there's no one works on the merge-mining option of p2pool server.
We should allow user to use their low hash machine (e.g. < 1T) to mine TRC otherwise it will not gain interest from ordinary people or newbies.
I will not against it if it's most people's decision, and you all know the downside of merge-mining.
If merge-mining is enabled, everyone will do merge-mining or not?
No. There are other merge mined coins out there with low hash rates - the coin still has to appeal to miners in the first place.
Otherwise he will lose money?
No. How?
If so, once TRC merge-mined with BTC, huge mining power will be thrown on TRC.
See above.
In this case, personal mining will be obsolete.
That depends on your costs. For many, personal mining has been obsolete for a while.
P2Pool could also be obsolete if there's no one works on the merge-mining option of p2pool server.
Merge mining is not just for p2pool, but p2pool is the easiest option for the home (independant?) miner to set-up merge mining, which is what
you seem so concerned about. P2pool does not use a server, the nodes are the "servers" as you call them - it is completely decentralised, which adds to the security of the network. Also, TRC is already listed in the p2pool coins networks (although this might need to be updated depending on what changes are made to TRC, if any)
We should allow user to use their low hash machine (e.g. < 1T) to mine TRC otherwise it will not gain interest from ordinary people or newbies.
Anyone can mine it with any amount of hash at any time, weather it is merge mined or not. The fact is, the more miners that mine it (or any other crypto), the higher the diff will go - that is a fact of mining. If you want a coin that has permanently low diff, you will have to create a coin that nobody knows about & mine it yourself - it will of course be worthless, because nobody knows about it or mines it.
...and you all know the downside of merge-mining.
Please explain it to "us all". As I have already pointed out, not one single coin has failed due to merge mining, they have all benefited. How many coins have failed that aren't merge mined? Hundreds, with more following suit every week.