Badrinath Ki Dulhania is the only sequel / series film which has survived at the box office in the last six months and there have been a line of them with most doing less business than their predecessors even though those films were years back.

Below are the results of the sequel / series film in the last six months in terms of their lifetime business. A minus means less business than the first one. . 

Rock On 2 (Nov 2016)

First Film (Aug 2008)

Result -58.84%

Force 2 (Nov 2016)

First Film (Sep 2011)

Result +24.15%

Tum Bin (Nov 2016)

First Film (July 2001)

Result -6.77%

Kahaani 2 (Dec 2016)

First Film (Mar 2012)

Result -43.40%

Commando 2 (Mar 2017)

First Film (Apr 2013)

Result +10.50% (expected)

Badrinath Ki Dulhania (Mar 17)

First Film (Jun 14)

Result +53% (expected)

The general problem is that barring Badrinath Ki Dulhania none of the first films of the other releases had much appreciation in that sequel / series could be made. Kahaani (2013) was a HIT but a big flop on television so it was a film which was dead after its theatrical run which meant a sequel was not supposed to happen. The others were even worse than Kahaani and no way should have had sequels and the results show that. 

Badrinath Ki Dulhania was only film out of the above where its first film had some likability and did well enough on television despite a cast which was not as big it is now. This gave the second one a chance and it had done much better which keeps the band alive though television also has to show results.

Now in May there is Sarkar 3 and this film is not on the Badrinath Ki Dulhania path as the first two films were not liked. The first one did well in Mumbai and South but doing well in a couple of circuits and appreciation are two different things.