Below are the openings of the recent sequel/franchise films and all the second films have opened less than the first one if we take into account inflation. A second film is made because it holds some brand value with the audience which will lead to a better initial of the second film especially if the first did not open which is the case with all the films below.
Rock On!! (2008) - 1,66,00,000 (400 screens)
Rock On 2 (2016) - 1,98,00,000 (1400 screens)
Eight years later with 1000 screens more but just 30 lakhs nett more collections

Tum Bin (2001) - 15,00,000 (90 screens)
Tum Bin 2 (2016) - 65,00,000 (1100 screens)
The box office has change a lot over the 15 years gap between the two films but its safe to say the opening of Tum Bin is better even though low.

Force (2011) - 4,53,00,000 (1450 screens)
Force 2 (2016) - 5,25,00,000 (2250 screens)
Five years later and 800 more screens but collections just 75 lakhs more

Kahaani (2012) - 2,91,00,000 (1100 screens)
Kahaani 2 (2016) -???
Remains to be seen if this can double up or close to the first film which opened poorly

The worst sequel of the above is no doubt ROCK ON 2 unless KAHAANI 2 is a shocker. The screen gap between ROCK ON!! (2008) and ROCK ON 2 is insane and its just ridiculous for collections to be so close.

ROCK ON 2 had a very poor opening day of 1.75-2 crore nett day. It is one of the worst openings of the year comparing with MIRZYA which was around 1.65 crore nett. The opening is not as low as the demonetizing of currency has had an affect and on a normal day ROCK ON 2 would be better. But beating MIRZYA is not the task and the demonetizing issue does not change the bigger picture. Even if it was not there the opening would still be poor. Going by the trends on Wednesday and Thursday business was down by around 30-35%. So on fair value this is a 3 crore nett opening which itself is poor meaning its about the film having no interest rather than anything else.

The writing is on the wall when a sequel to a film like ROCK ON 2 (2008) is actually being made at double the cost when the first one had hardly any takers. The first one probably was bumped up by media but 100 or 200 people can't be taken seriously when the core film going audience has rejected a film. The main issue is that there is no brand value. This means the film can't really have a higher cost than the first film if it is to be made. ROCK ON 2 is a standalone film and could have been named anything. In fact it may have been better to name it something else because ROCK ON had more negatives than positives.

Its an uphill battle for the film but nothing can be totally written off until the Saturday figure comes. The opening day of ROCK ON (2008) was 1.66 crore nett which was poor at that time and it was on just one third of the screens of ROCK ON 2. This illustrates how bad the opening of ROCK ON 2 is taking the fair value of 3 crore nett.