Many of the new gTLDs will fail to gain critical mass (>1 million domains active).
Some will be complete failures and others will be very successful.
The .com TLD will continue to be the standard for accessing the global market. (Currently over 103 million domains.)
In some countries, .com is (or has been) being overtaken by the local ccTLDs in terms of local domains/websites.
It will take an average of five years to establish a new gTLD and the registration patterns of the first three years are highly speculative.