Proposal for testnets to help wallets, bakers and smart contract developers

• Alphanet - currently active protocol for testing of smart contracts - stable for at least 3 months
• Zeronet - currently proposed protocol for testing of tooling by wallets, bakers and smart contract developers - stable for at least 3 months
• Devnet - next protocol - can be reset all the time

Any thoughts or comments on this proposal?