Doctors offices are terrible, but not as bad as hospitals, for waiting times and except for ER's there is little instrumentation to provide useful inputs for the doctor at time patients arrive and few remote monitoring tools to cut down on visits.  I think newer medical instruments (gages) could help deal with the overloads better than simply "more doctors." 

Cardio specialists use EKG during signin, for example, but GP's could augment the paperwork with real data if they had better med records and appropriate instrumentation to speed up the process while the patient is waiting for doctor.  I suspect most doctor visits could be handled by technicians and nurses given med history and instrumentation for updates to med history.  

Home devices such as oxygen-in-blood monitors as well as better BP and Glucose monitors are coming at lower costs now.  

Note: I have no financial interest in instrumentation...just hate waiting so long before the techs get around to measurements and hate filling out med history for each doctor in referral chain when they could share med records. Why all the paper in 21st century?

Luckily I only have to do that once a year.  Others are not so lucky.