no one will ever be forced to use Magento 2, in fact even if this version was released, it is not ready for production use. there are lots of bugs and errors. lack of properly working extensions and lots of unknown security vulnerabilities. (unknown for us, but hackers already know)
if you are going to use it just for development and testing - go ahead and install Magento 2.
but if you are going to setup your first shop and probably you already have some offline business running, i would highly suggest to install Magento 220.127.116.11
then safely run your online business on Magento 1 for at least for the next 3-5 years, until Magento 2 get rid of the heaps of errors and our community acquires a good knowledges and get lots of properly working extensions.
note: you will be able to migrate your data from M1 to => M2