Just my humble thoughts (ramblings) on the matter. I don't care if people invest in .nochance or .com only, just chewing the fat!
Sure there are those a bit preachy, in both camps (pro and against gTLDs), but there are also those who are entirely on the fence, just looking at what's going on without bias. Rather than jump to a defensive position, maybe look for that intuitive info lurking amongst the mass of hope and emotions?
[I believe the following stats to be reasonably accurate, enough to make my point]
Since August 19, 2015, there have been 29 .online gTLD sales.
Most (at a glance) are very specific, some company name or whatever. From another quick glance, most are either not developed or just redirect.
While this is only public sales, I doubt there are a great deal going on that is not public (why would there be, is this some new gTLD round the back domain trade no-one knows about??)
Also, while such stats don't tell you what will happen in the future, they do tell you what is happening right now. Nothing. So invest in any gTLD, but none of this tells you whether you'll get a sale soon, or have to wait 10 years, or never, or even no ROI regardless of the waiting period.
That is the risk. The major unknown. There's no data nor patterns to decipher, just hope, and waiting, and hoping...
Of the 650,000 registered .online, 426,000 are parked.
29 sales in 1.5 years out of hundreds of thousands, is not so good in my opinion.
Would you gamble on "GameX" in the casino when hundreds of thousands of people lost to only 29 wins...?
And it's not different, because why not the same logic as gTLDs might one day flourish, and "GameX" at the casino will suddenly start going in the favour of the players and not the house...?
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If gTLDs are to "take off" then online will be just one of the many that the world, people, businesses etc embrace and start using mainstream.
If this happens, given that there are hundres of them (decent ish ones), they will not hold value because so many to choose from. Why .online, and not .site, or any other? If people embrace one, they'll embrace most of them.
I believe it's entirely possible that in 5 or 20 years time many of the gTLDs will be in use in a big way, but I think it'll dilute the ROI a great deal because of the vast choice.
People here are predicting such things will dilute .com and not be king, well if that happens it'll likely mean all TLDs are fair play, and the general market value will plummet across the board, again because no longer is there a fight for the top ROI on .com, but so many to choose from it'll become a buyers market...
I think .com will always stand out. Not because I'm some drooling .com fan boy, but because it's business, and like with many things, it only needs some initial momentum for it to continue and motion to further the momentum.
Like companies jumping on Facebook years ago. Once a load do it, the rest follow and it keeps happening. This is the likely future of .com, but, who knows