So, your new template will have 16,000 fields? Not to be a spoilsport, but that seems like a poor schema design.
What exactly are you trying to do? Create one template that replaces all your existing 80 templates? Do you have existing XML that you also hope to be able to open with your new template?
InfoPath doesn't copy / paste well from one form to another as far as controls go. And for data sources, you can create a data source off the schema from another form, but it has some quirks. The main annoying one being that if you create the template from another schema, it will lock the schema in the form.
You may just want to start with whatever template has most of what you need, and manually add to it instead, but I would not really recommend creating a form with such an immense schema.....
When you say "view" this data, are you just in need of a reporting solution that can show the data from the assorted XML for those 80 XSN?