Trends dictate the future, and websites built with Magento 1 will be required to upgrade to Magento 2 sooner than later. Magento developers have stopped developing new features for Magento 1, leaving only security updates, which may also be discontinued in the future. The reason why you shouldn’t wait is that migrating to Magento 2 will require you to replicate all the customisations you made in the first version, so the longer you wait, the longer it will take you to successfully migrate to the updated version of Magento.
The biggest problem with Magento 1 was probably the lack of performance (page loading speed) and adaptation to mobile commerce tools. Megento 2 is essentially a better solution for e-commerce because it can offer:
Making shopping more convenient for consumers;
Better user experience;
Easier administration;
Better customisation for mobile devices;
Improved productivity and safety;