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In order to prevent high transaction fees we need to increase blocksize and remove the 7tps limit. It appears that the majority of community is in "pro" of this so it should be done quickly to prevent the inevitable high transaction fee explosion. When transaction fees become important hopefully miners will make their fees by high volume of transactions (all at a low fee).

Example:

Bitcoin high frequency trading:   

47,000 tps (around the peak rate of VISA) = 28,200,000 transactions per ~10 minute block

Fee of 0.000000017 = 5 bitcoins per block transactions reward for miners. Easily sustaining the network at a high price. If Bitcoin is going to be a global cash system we'd probably have hundreds of thousands of transactions per second. But having more transactions per second than VISA is a good initial.

High transaction fees:

7 tps limit:

5 bitcoins (transaction reward) / 4200 (tranactions per block) = 0.001190 transaction fee. Way too high for the consumer paying his hamburger at a restaurant.

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Combining pruning + near no limit of transactions = low transactions fee.

Why artificially limit a open concept market? The market will take care of the fee, we shouldn't impose limits on it except to prevent massive blockchain spam or otherwise malicious activities.