A sweeping set of recommendations about what Chicago-area transit could look like in the future is making its way to lawmakers, with regional planners eying new sources of funding for the CTA, Metra and Pace and raising the prospect of consolidating them into one agency.

       But already, influential business groups have raised concerns about some of the proposed recommendations, pushing back on a concept to expand the sales tax base and questioning whether instead of seeking to enhance transit, the planners should focus instead on the reality of still-diminished ridership. Leaders of suburban counties have also reacted to the proposals, laying out their views for suburban representation on transit boards and pushing back against any use of motor fuel taxes for transit.

       “I’m not sure the report’s grounded in reality,” said Mark Denzler, president and CEO of the Illinois Manufacturers’ Association, who was part of a committee advising on the proposals.