I believe Season One way back in 1963 had 42 episodes. Doctor Who was cheap television, with a budget for a children's show. It's budget was actually £2,000 per episode, equivalent to £35,000 in today's money. Considering upon its return it had a budget of £10 million for Series One in 2005, which was spread out over 13 episodes, back in 1963 it was a shoestring of a budget.
I know that RTD was recently talking about an increase in budget, mainly because of the Disney+ deal. However, bear in mind that we're only getting 4 specials this year and an 8 episode run with a Christmas special next year, it seems we're getting less bang for our buck.