Ok let me try again.
1)New gtlds can be taken away for any reason at the registries discretion, Unlike .Com's where their are processes to follow.
2) New gtlds can raise prices to whatever they want with short notice, Unlike .com's pricing which is protected by the u.s. government.
Research and verify for yourselves.
Actually I meant I thought I might be off topic. All TLD's have the right to increase their pricing per giving notice to ICANN, even .com.
(f)
Adjustments to Pricing forDomain NameRegistrations. Registry Operator shall provide no less than six months prior notice in advance of any increase for new and renewal domain name registrations and for transferring a domain name registration from oneICANN-accredited registrar to another and shall continue to offer for periods of up to ten years new and renewal domain name registrations fixed at the price in effect at the time such offer is accepted. Registry Operator is not required to give notice of the imposition of the Variable Registry-Level Fee set forth in Section 7.2(b).
I think the issues with new TLD's being taken back has to do with mistakes within their API system, where lots of domains were released but in fact reserved by ICANN. I've had this happen to me.
Others may have been pulled due to spam, or misuse of the domain per the T&C of the registry, which is a good thing keeping their TLD respected. If it was done by mistake, contact the registry and fix the issue.
As for pricing many new gTLD's etc. are offering low entry rates but higher renewal after that. Many don't investigate what the price will be moving forward and this makes it appear as though your pricing has been jacked up for no reason. This has also happened to me and that's why now I always check past one year pricing when registering a domain. I also think some misleading promotions by a few registers has caused this confusion.
I own many new TLD's and my renewal pricing has remained the same, if they do go up I'll be questioning if a six month notice was provided to ICANN.
It's a fact .com is king but unless closed eyes are watching the new TLD's, sites are being launched daily and mother time will tell the story but not two years in. As for failing TLD's I'm a firm believer they will be purchased by another company rather than falling to the wayside but time will tell on that issue too.
By saying if you don't own .com, you don't have much is the opinion of the OP and a few others but it's been debated here time and time again and many don't agree with this opinion, including myself.
Could I be wrong with all of this? Sure I could but if myself and others are not then hopefully we can make some money down the line rather than wishing we would have got onboard when the ship sailed vs. trying to get on the ship when it's already out to sea.
One final thought. I think many, including myself are over pricing some of our new TLD's, trying to compare them with .com which isn't the case. Sure we all have a few that deserve a high dollar price tag, take it or leave it but a majority are just out of range. The over pricing has diminished current sales by domainers which is being reflected within the sales charts. I'm not saying give them away but reasonable prices at this juncture will help the movement going forward. JMO..