Lifecycle of cryptocurrency mining from GPU to ASICs

Are GPUs becoming less rewarding? What do you do about the current state of cryptocurrency mining with new ASIC miners coming out?

In this presentation, we look at the major cryptocurrencies and how long they were mineable by GPU before the first ASICs. This cycle has repeated itself throughout the beginning of cryptocurrency to today.

References:
https://en.bitcoin.it/wiki/Category:History
https://en.bitcoin.it/wiki/Open_Source_FPGA_Bitcoin_Miner
http://www.ofnumbers.com/2014/04/20/how-artforz-changed-the-history-of-bitcoin-mining/
https://bitcointalk.org/index.php?topic=9047.0
https://en.wikipedia.org/wiki/Ethereum
http://news.yahoo.com/butterfly-labs-announces-next-generation-asic-lineup-054626776.html
http://garzikrants.blogspot.com/2013/01/once-upon-time-in-china-package-shipped.html
https://bitcoinprbuzz.com/zeusminer-announces-the-first-scrypt-asic-miners-to-ship-worldwide/
https://www.coursera.org/lecture/cryptocurrency/short-history-of-altcoins-nyp82
https://thenextweb.com/hardfork/2018/02/02/a-brief-history-of-bitcoin-mining-hardware/
https://blockonomi.com/bitmain-asic-ethereum-miner/
https://bitcointalk.org/index.php?topic=421615.0
https://cryptomining-blog.com/7117-the-first-x11-mining-asic-ibelink-dm384m-asic-dash-miner/
https://z.cash/support/zcash-sprout-launch.html
https://www.ccn.com/bitmain-to-release-first-zcash-asic-miner/
https://z.cash.foundation/blog/asic-equihash-study/
https://forum.z.cash/t/what-happened-at-the-zcon0-mining-workshop-and-more/30062
https://en.wikipedia.org/wiki/Monero_(cryptocurrency)
https://www.crowdfundinsider.com/2018/04/132049-mining-monero-more-profitable-right-after-anti-asic-hard-fork/
https://medium.com/obelisk-blog/the-state-of-cryptocurrency-mining-2d8521bd754a
https://bitcoinwisdom.com/bitcoin/difficulty
https://bitcoinwisdom.com/litecoin/difficulty
https://etherscan.io/chart/difficulty
https://bitinfocharts.com/comparison/zcash-difficulty.html
https://bitinfocharts.com/comparison/monero-difficulty.html