Magento 1.x is a dated platform and the official end-of-life date is nearing. This means Magento 1 (1.1-1.9) will no longer be supported with maintenance and security patches. Continuing to operate your eCommerce store on this older, unsupported platform will make your site vulnerable. If you are looking for a familiar platform to upgrade to and achieve continuity, then Magento 2.x is a natural choice.