Of course .online is a worthy investment...if you pick the right name for your site. Make a use case and find some that work for you. Not expecting 7 digit sales from the space right now. Who nows what 5 years holds?
Search results haven't caught up to all the new tlds and more site build outs will certainly help.
An example, do a google search for order.online
Now try again with
http://order.online
Now type it right into the browser bar.
Still nothing. So the search string needs to catch up to the fact that these new domains are websites.
The registry owners have a lot of work to get registry premiums indexed properly so a handsome (they never are) parking page appears. If the majority of the new tlds are held for a higher $ by the registry than they need to build out the inventory and work together with the search engines to make sure the extensions are recognized by google and conform to the proper guidelines.
The more the registry co's invests in ensuring the premiums are indexed and recognized and built the more the available supply will have room for price appreciation and end user adoption. Because no one wants to hand out a business card with their domain name and it won't bring up a site on direct type into the browser bar.
There should really be some open source standards put forth by domain name owners, the entrepreneurs enabling many new tlds to launch successfully. And the various registry owners need to make sure to follow google policy and procedure to make sure those investing in the tlds are entering into a legitimate long term opportunity.
These domains may be quick sales for some, we've seen the stories. For others, with the right effort by all sides we will see larg long term gains and successful sites on tlds like .online
And still, no one on the forum would turn down the opportunity to own that domain.
Order.Online would be a complete category dominating name. But it would need to be built properly.