Update Schema in SSIS Export Package When Source Schema Changes
Easy? Not really - SSIS is very picky about the metadata that is used in the data flow, so changing schema is challenging to deal with. 

My typical solution for these types of scenarios is to generate the packages through either the API, or using Biml (BI Markup Language). {Disclaimer: My employer (Varigence) created Biml.}

The API is a fair amount of work, and assumes you are comfortable with .NET development. Biml is an alternative that doesn't require as much .NET knowledge. You can use Biml through BIDS Helper, which is a free download.