If you haven't even thought about the details, how do you know it will work?
You don't even know what you're going to do, but you're doing it anyway?
How will you prove burn for cryptonote coins? They don't have burn addresses. Even if they did, you wouldn't be able to prove how many coins were sent. There are a lot of cryptonote coins.
How will you prove burn for coins that don't have a block explorer? Can you host block explorers for 200 different coins, just so you can exchange them? Or are you not really going to accept every coin?
If a coin's price changes every day, will you change your exchange rate every day for all 1200 altcoins you accept?
If a coin is delisted from all exchanges, how will you determine the exchange rate?
How many millions of dollars would your coin have to be worth to exchange it for every altcoin? If you're using your coin to buy all other coins, then you're saying it can do what Bitcoin does on every exchange. Do you honestly think your coin can replace Bitcoin?
Can I launch a new coin, premine 100 Billion of them, and then exchange them all for your coin? Can I do it with a new coin every day? What about 10 times a day?
What about forked coins? Some altcoins have multiple forks, so you'll need to have an explorer for each fork. You'll also need to honor the same person's coins on each fork.
What if people burned coins last year for another reason, will you honor those burns?
What if they just burned their old NAUT in exchange for the new NAUT - they still burned coins, and you say you accept all coins. Will you honor burns for all coin swapovers to new blockchains?
What if they just do a snapshot, and they get their new coins without burning the coins from the old blockchain. Those are coins, and you accept all coins. Will you trade your coin for old worthless coins everytime a coin does a snapshot process?
Will you merge-mine with BARR, when people burn their altcoins with BARR's process that already works and is launching in 3 days, already listed for trade on the NXT exchange?
If you want to see how a serious project works, this is our ANN:
https://bitcointalk.org/index.php?topic=1219460.0