There is nothing impossible in the crypto world, "Tron replaces Ethereum" might happen, but it will really take a very long time in my opinion, remember Ethereum is the favorite altcoin of many people, regardless of its shortcomings.
The fact that many projects run inside Ethereum's ecosystem is a feat itself and TRON should do whatever it takes to overtake that achievement but until then Ethereum is enjoying currently as the platform of choice for most crypto projects due to its very active development - a challenge for TRON team indeed.
