"In our view, upside is restricted by hyper competitive scenario, with Jio expected to remain aggressive in race to gain revenue market share; long-dated cost synergies and lack of debt reduction in medium term," Emkay said in a latest report.
The progress on regulatory approvals would be closely watched as both the entities have a number of pending litigations, it added.
The combined entity is estimated to have annual cost synergies (capex and opex) of Rs 14,000 crore from the fourth year of merger, with 60 per cent this as opex savings. The largest component of opex synergy would be network followed by IT spends, Emkay noted.
The targeted synergies are achievable and the combine is "unrivalled" in terms of revenue market share and spectrum, JP Morgan has said but flagged challenges such as execution of complex mergers and the back-loaded synergies.
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It further said that "execution of such a complex merger is rarely perfect, revenue market share gains for the combine likely to track below expectations especially over the next 12-24 months given merger complexities and distractions".
According to Jefferies, while the cost synergies are healthy, the "peak synergies will come four years post integration and uncertain given the sector set up".
IDFC Securities felt that challenges for the industry are unlikely to change due to sustained aggressive strategy of Reliance Jio to gain scale. "We expect operational pressure would continue to mount with increased capex by incumbents to retain market share," it said.
Religare said that while the merger is a positive outcome for Idea as it gives the company scale and access to capital, defending market share will be a challenge.
"Both Vodafone and Idea are estimating synergies...At the end of Year 4. We believe that weakening revenue market share (RMS) remains a key operating risk and estimate an RMS loss of Rs 42 billion (Rs 4,200 crore) for the combined entity in FY'19. This will largely offset any synergy benefits and hence recovery in industry growth will remain the key driver," said Religare.
JM Financial said merger upside is tempered by extended completion and synergy timelines.
"While we see significant potential for value creation over the long-term (3-4 years), our near-term outlook is dampened by longer M&A approval cycle with risk of delays... lower opex synergies...Rather extended time-frame for full synergy extraction...Continued EBITDA erosion in the near-term, led by Jio," JM Financial pointed out.