Reducing the block reward to 2 is a good idea to curb the circulating supply. I'm not sure if it would be enough to maintain it's value because 100m in circulation is already a lot then again I could be wrong though.
This leads to an rising Price if the demand stays the same
With cryptocurrencies' volatility it doesn't.Friends, tell me, please, what it means in practice. I can't understand this technical question. Is it good or bad? Will it increase the cost of transactions? Will it bring down the miner's interest to ETH? Give me detailed answers, please, if you know 
Change is good. When asic resistance was introduced to monero its hash rate went down by 80%. It'll surely bring down a lot of miners after the fork then the remaining miners would just continue to mine as the difficulty adjust like nothing happened.